Why there will be change in the value of least distance of distinct vision in old age?
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As we age the lens gets less flexible so our ability to reduce its focal length decreases. If we use your value of 500mm for the least distance of distinct vision of an elderly person, i.e. u=250mm and v=17mm, the focal length of the lens works out to be 16.44mm.
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25 cm is the least distance of distinct vision. This distance increases with age, due to decreasing effectiveness of ciliary mussle.
The least distance of distinct vision for a young adult with normal vision is about is 25 cm. It is the least distance of distinct vision of an object to see clear and distinct image.
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